Vapor electric device.



' E. WEINTRAUB.

VAPOR ELECTRIC DEVICE.

APPLICATION NLED 116.112, 1911A mmm.

Patented June 10, 1913.

A EY ULf/tvlw i595' TTUHNE'Y.

vTo all whom t may concern:

PATENT FFCE..

EZECHIEL'WEIMRAUB, 0F LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRICi COMPANY, A CORPORATION 0F NEW YORK.

VAPOR ELECTRIC DEVICE.

Specification of Letters Patent.

Patented June il), i w13.

, Be it known that I, -ltzucniEL Weinmann, a citizencf the UnitedStates, residing at Lynn, county of Essex, State of Massachir setts,have invented certain new and useful Improvements in VaporElectricDevices, of,`

which the following is a specification. l

My invention relates to vapor electric devices and most particularly toa form of lamp of high efficiency having a,consi der able voltage dropper unit length.

In my previous Patent Number 917,212, I have described a mercury vapordevice in which the arc plays in a quartz tube which is surrounded by an`outer glass tube. In the construction described in this patent, thequartz tube is open to the space surrounding it, and therefore thepressure 1n the quartz tube when the lamp is operating is the same as inthe space outside of it. When a lamp of this character is operated'underconde tions which allow considerable pressure to accumulate within thequartz tube, a luminant can be secured which has a high elliciency andconsumes a greater voltage than when `the inner envelop is allowed toremain in free communication with the space surrounding it. Inaccordance with my present invention, I have secured this efl'ectwithout the necessity of separately evacuating and sealing off the innerenvelop. This result is accomplisheil by providing only a constrictedpassage' from theinner envelop to the space surroundingit whichsufficiently closes the inner tube during the operation of the'lamp topermit pressure to accumulate therein. The other end of the inner tubeis provided with a valve to permit vaporized mercury which may escapeinto the outer space to flow hack into the inner tube. l

The accompanying drawing is a sectional view of my improved form oflamp.

The outer tube 1 consists ot' Lgfluss, or other transparent material, inwhich are sealed leading-in wires 2 and 8 in the ,usual man ner. nside`of this container l4 is situated an envelop or tube a consisting of.'fused quartz or silica, or, in fact, of any material more refractorythan glass. The upper end of this envelop is drawn out into the form oi'a long narrow tube 5 through which. the continuation of the leadinginwire or stem of the electrode 6 loosely passes, leaving enough space topermit the tube il to be exhausted at the same time that the spacesurrounding it is exhausted. This construction also fmaires itunnecessary -to seal a ccnluctor into silica.. The other end of' thistube is provided Iwith suitable supports 7 which hold it in a centralposition'. This end of the envelop Il is provided with a `cylindricalvalve 8 which prevents the mercury 9 inside of' the tube from boingforced into the space surrounding the tube by a pressure in the innerenvelop when the lamp is operating and, at the same time, allo-ws themercury to return from the surrounding space into the inner tube whenthe level of the mercury outside the tube has become high enough to liftthe valve.

The lamp is started by tilting in the usual manner, the starting of thearc within the inner tube beingl assured as the stem of electrode 6 isexposed only at a very narrow space between the glass surrounding thesame and the tube 5. The spreading of the arc,L after it has oncestarted from the inside of the envelop 4f of the outside space, isprevented by a long,r opening` of practically capillary dimensions whichsurrounds the stem of the electrode (3; also by the difficulty ot'creating a new cathode spot on the surface of' the mercury outside theinner tube.

During the operation of the lamp, some of the mercury vaporized by theheating of the arc within the inner envelop finds its way into the outerspace and thus raises the level of the mercury in this space. Thisevaporation is ordinarily not great enough to remove any substantialpart of the mercury during an ordinary running, period of the lamp. Atthe end of such period, after the lump has cooled ofi and the pressurewithin the inner envelop has been reduced, the level of the two mercurysurfaces is restored by the lifting of the valve S as already described.

I have thus provided a constrimtiou which permits a mcucury arc` tc herun inside a quarta envelop under appreciable pressure withmjit thenecessity off providing` seals.

lV hat 'l' claim as new and desire to secure by Letters latent of theUnited Ctates, is:

inner envelop to permit vthe return of vapor-` izable material to theinner envelop.

2. In a vapor electric device, cooperating electrodes atleast one ofwhich is mercury, a double Walled-iv envelop, the space Within the innerWall being in communication with the space outside said Wall through apassage'. of capillary dimensions and@ a valve permitting theaccumulation of ,Jpressu're Within said ispace but permitting a returnof vaporized`mercury to said space vivhen the pressure is lowest.

v3, ,..In a vapor electric device, coperating electrodes at least one ofwhich consists of mercury, 'an' outer inclosing envelop, an innel"envelop containing said electrodes, the

space Within said inner envelop communif eating Wlth the spaceintervening between i .'said envelops by a constricted passage, and

u valvel in said inner envelop for equalizing U; mercury level Withinand Witho-ut the .Inner envelop.

:. a.' In a vapor electric device, coperating electrodes atleast one ofWhich consists loit' mercury, `an outer inclosing glass envelop,

'an 1nne1'"'quartz envelop containing nsaid electrodes, said quartzenvelop being contracted into the form of a constricted tube at onevencl-v through which the stem of. one of saidelectrodes passes, and avalve at the other end of said quartz tube to enable the level ofmercury inside and outside the tube to equalize. y y

5. In a Amercury vapor lamp, the combination of a transparent envelop,an envelop of fused silica therein communicating With the outer envelopthrough ay tube of capiltube, and means permitting theA return ofvaporized'mercury to the quartz envelop thereto is in excess ofthejpressure Within.

In Wltness whereof, I have hereunto set .my hand this tenthfday ofAugust, 1911.

EZECHIEL WEINTRAUB.

Witnesses: Y

JOHN A. MoMANUs, Jin, ROBERT SHAND.

' lary dimensions, a mercury cathode and a` 'cooperating solid anode forsaid silica envelop, a leading-1n conductor for saidanode 40 'passingloosely through the communicating

